Measuring, signalling and checking, apparatus, namely, angle finders in the form of encoders and angle transducers; electronic instruments for adjusting the angles of rotor blades in wind power plants, namely, angle finders, in the form of encoders and angle transducers; apparatus and instruments for conducting, switching, transforming, accumulating, regulating and controlling electricity for adjusting the angles of rotor blades in wind power plants; data processing equipment and computers fo...